Help a shooter with your expertise

Getting an agent as a new screenwriter- any recommendations or advice ?

Shooters- so this is the perennial mystery- as I know sod all about this-what agents around the UK or abroad- are the best to approach and do you have any recommendations or advice. The scripts/treatments are generally of sci-fi/disaster, RomCom, drama/thriller genres.Thanks in advance and a Brucey bonus for the best reply...